Blue-Green Deployment

Everyone wants to check about their application before releasing the latest features with latest version into the Production or Live, Isn’t it?

Here we go with the Blue Green deployment Approach?

In Practical Scenarios lets understand the situation here to go with this approach, So Basically, Your application needs to get some notification message about any sales or discounts so before deploying directly into Production we will be using the some slots here in Azure Web Apps to test the Features or any other changes into the Live. So Basically we will deploy our latest code to Slot [Staging slot/Green ] then will swap with the Live Production Slot[Blue Slot]

Advantages of Blue-Green Deployment

Blue-Green Deployment is a deployment strategy that reduces downtime and minimizes risks during application releases. Here are its key advantages:

1. Zero Downtime Deployment

• Users experience no interruptions since the new version (Green) is deployed alongside the existing version (Blue).

• The switch between environments happens instantly by updating the load balancer or traffic routing.

2. Instant Rollback in Case of Issues

• If issues arise in the Green environment, you can quickly revert to the stable Blue version.

• This avoids long troubleshooting sessions in production and ensures business continuity.

3. Improved Testing in a Production-like Environment

• The Green environment allows thorough testing before switching live traffic.

• You can perform smoke tests, performance tests, and security checks without affecting users.

4. Reduces Deployment Risks

• Since the Blue environment remains untouched, deployment failures won’t break the live application.

• You can deploy frequently with lower risk and greater confidence.

5. Seamless User Experience

• No maintenance windows or downtime messages for users.

• Even in case of failures, users are redirected back to the stable version without noticing issues.

6. Supports A/B Testing & Gradual Rollouts

• Traffic can be gradually shifted to Green (e.g., 10%, 50%, 100%) to monitor performance.

• A/B testing is possible by routing users based on specific rules.

7. Works Well in Cloud & CI/CD Pipelines

• Modern cloud platforms like Azure, AWS, and Kubernetes support Blue-Green Deployment with traffic routing mechanisms.

• CI/CD tools like Azure DevOps, GitHub Actions, and Jenkins integrate well with this strategy

  Implementation of Blue green deployment by Azure DevOps Pipelines

• Firstly we need to have the DevOps pipeline from the Azure DevOps By the Pipeline we need to create the Staging or Green Slot, after that we need to deploy the latest changes to the New Slot then after that we need to verify the latest Changes After Deploying the Code to the Staging Slot, Here the Deployment can be happen by many ways by we used the Azure DevOps Pipeline to deploy the latest changes

• After Checking the Code we need to Swap the Slots with the Main Live Slot[Production or Blue Slot]

• As Overview the steps we followed by the Pipeline implementation for Blue Green Deployment

• 1. Create the Staging Slot
• 2. Deploy the Latest Changes to the Stage Slot
• 3. Verify the Changes in the Staging Slot
• 4. Swap the Slot with the Production Slot.
• 5. As Rollback strategy we can re swap slot back with the live slot.